$(document).ready(function(){
    /* This code is executed after the DOM has been completely loaded */

    var totWidth=0;
    var positions = new Array();

    $('#slides .slide').each(function(i){

        /* Traverse through all the slides and store their accumulative widths in totWidth */

        positions[i]= totWidth;
        totWidth += $(this).width();

        /* The positions array contains each slide's commulutative offset from the left part of the container */

        if(!$(this).width())
    {
        alert("Please, fill in width & height for all your images!");
        return false;
    }

    });

    $('#slides').width(totWidth);

    /* Change the cotnainer div's width to the exact width of all the slides combined */

    $('#menu ul li a').click(function(e,keepScroll){

        /* On a thumbnail click */

        $('li.menuItem').removeClass('act').addClass('inact');
        $(this).parent().addClass('act');

        var pos = $(this).parent().prevAll('.menuItem').length;

        $('#slides').stop().animate({marginLeft:-positions[pos]+'px'},450);
        /* Start the sliding animation */

        e.preventDefault();
        /* Prevent the default action of the link */


        // Stopping the auto-advance if an icon has been clicked:
        if(!keepScroll) clearInterval(itvl);
    });

    $('#menu ul li.menuItem:first').addClass('act').siblings().addClass('inact');
    /* On page load, mark the first thumbnail as active */



    /*****
     *
     *	Enabling auto-advance.
     *
     ****/

    var current=1;
    function autoAdvance()
    {
        if(current==-1) return false;

        $('#menu ul li a').eq(current%$('#menu ul li a').length).trigger('click',[true]);	// [true] will be passed as the keepScroll parameter of the click function on line 28
        current++;
    }

    // The number of seconds that the slider will auto-advance in:

    var changeEvery = 10;

    var itvl = setInterval(function(){autoAdvance()},changeEvery*1000);

    /* End of customizations */
});
